Automatic stoker



Sept. 29, 1936. c, 3, LARSEN 2,055,579

AUTOMATIC STOKER Filed May 15, 1954 5 Sheets-Sheet l Sept. 29, 1935. c, c, LAR EN 2,055,579

AUTOMATIC STOKER Filed May 15, 1934 5 SheetS- -Sheet 2 Invenlor adj/arse I /I Home y Sept. 29, 1936. 3, Q LARSEN 2,055,579

AUTOMATIC STOKER Filed May 15, 1934 5 Sheets-Sheet 15 Inventor Yd 1102151922 M f1 llomcy 7 Sept. 29, .1936. 5

C. C. LARSEN AUTOMATIC STOKER Filed May 15, 1934 5 Sheets-Sheet 4 f1 Home y Sept. 29, 1936. c. c. LARSEN I AUTOMATIC STOKER Filed May 15, 1934 5 Sheets-Sheet 5 Patented Sept. 29, 1936 UNITED STATES AUTOMATIC STOKER Clarence G. Larsen, Bismarck, N. Dak., assignor to Lignite Combustion Engineering Corporat:

itit i ii i tion, a corporation of North Dakota 7 Application May 15,

2 Claims.

This invention relates to stokers for furnaces, and more particularly to a coal feeding mechanism therefor. I

The principalobject of the invention is to provide an automatic .stoker that is simple in construction, dependable in operation and so designed as to be swung freely into and out of operative position with respect to the furnace.

The invention, together with its objects and advantages, will be best understood from a study of the following description taken in connection with the accompanying drawings, wherein:-

Figure 1 is a front elevational view of the stoker.

Figure 2 is a detail view taken approximately on the line 22 of Figure 1.

Figure 3 is a top plan view of the stoker.

Figures 4 and 7 are sectional views taken substantially on the lines 4-4 and 1-1, respectively, of Figure 3. g

Figures 5 and 6 aredetail sectional views taken substantially on the lines 5-5 and 6 6, respectively, of Figure 4, and

Figure 8 is a perspective view of a reciprocating plate forming part of the feed mechanism.

Referring to the drawings by reference numerals, it will be seen that in accordance with the present invention, a portion of the wall 5 of a furnace is provided with an opening 6 over which is placed an attaching plate I. The plate I is provided with an inspection door 8 and a clean-out door 9. Suitable latch means [0 is provided for the door 8, while latch means H is provided for the door 9.

A supporting plate [2 is hinged to the aforementioned plate 1, as at 13, and mounted on the plate 12 adjacent its free end for alignment with the feed opening l4 provided in the plate 1 is a feed casing l5 of suitable construction. In the top thereof, the casing I5 is provided with a funnelshaped inlet I6 that aligns with the hopper H for conducting the coal from the hopper into the feed casing l5.

Mounted for reciprocation within the feed casing I5 and at a slight incline, is an adjustable plate l8 operating on guides l9. For adjusting the plate I 8, there is provided a bolt that is pivoted at one end to a lug 2! depending from the plate l8 and has a threaded free end operating through an aperture in a cross bar 22 extending between opposite sides of the casing l5. A hand nut 23 is threadedly engaged with the free end of the adjusting bolt 2|].

Inwardly from the discharge plate I5 of the feed casing I5, said casing, at the bottom thereof, is provided with a trough-like portion 24 in which 1934 Serial No. 725 810 Q R Q (o1.110-115 tri operates a rotary beater 25 mounted on a shaft 2.6.- The plate l8, obviously, may be adjusted for exposing the desiredportion of the periphery of the beater 25 to control the point of contact of the coal on the periphery of the beater, thereby controlling the velocity imparted to the particles of coal passing over the beater which velocity in turn will control the distance which the particles of coal will be thrown by the beater. In this connection, it will be noted that the discharge plate 55 of the casingextends into the furnace slightly above the grate line 21. The mechanism for driving the beater 25 will be hereinafter more fully referred to.

Mounted for reciprocation within the casing l5 and across the inlet mouth l6 of the casing is a fuel feeding ram 28. The ram 28 is moved along the plate i8, and at the rear end thereof, the ram 28 is provided with a lug or enlargement 2 l a which has a pin and slot connection, as at 32 with one arm of a lever 33. The lever 33, intermediate its ends, is pivoted between lugs projecting laterally from the casing [5, as at 34.

Supported from one side of the casing l5 through the medium of a bracket 35 is a gear case 36 clearly shown in Figure 7. Extending through the top of the gear case 36 is a stub shaft 31 which, on its upper end, is provided with a disk 38 equipped with a crank pin ii! to which is connected one end of a connecting rod 39. The connecting rod 39 has a threaded end which extends through the apertured free arm of the lever 33, which end of the lever 33 is maintained in operative engagement with the connecting rod 39 through the medium of a fixed collar 4! on the rod 39 and a hand nut 42 screw-threaded 0n the free end of the rod 39. By means of this hand nut 42, the amount of lost motion between the collar 4! and the hand nut 42 may be controlled, this in turn controlling the travel of the ram 28, which again in turn will control the amount of coal moved forward by the ram 28 by each forward movement of said ram.

The aforementioned shaft 26 for the beater 25 also extends through the gear casing 36, and that part of the shaft 26 which extends through the gear casing 36 is connected with the aforementioned shaft 31 through the medium of suitable gearing 43.

Mounted on the plate 1, below the feed casing 15, is a blower which includes a suitable blower casing 44 having a discharge 44 extending through a suitable aperture in the plate I, and arranged within the casing 44 is the blower fan 45 mounted on an extension of the shaft of a motor 46.

The motor for driving the fan is suitably supported by suspension brackets 47. The brackets 41 are secured at their upper ends to the plate l2, and in this connection it will be understood that the blower casing 44 is supported from the feed casing I 5, being welded or otherwise secured to one side of the casing 15 (see Figure 1), so that all of the parts will swing with the attaching plate l2 as a unit. Casing I5 is welded or otherwise secured to plate l2 as at w.

The motor 46 has a belt and pulley drive connection 48 with the free end of the beater shaft 26 and thus it will be apparent that the blower, the beater 25 and the fuel feeding ram 28 are all driven from the one motor 46.

It will be understood that the stoker may be employed with any suitable automatic control equipment, and in operation, when the equipment calls for heat, the motor 46 will be automatically started. The drive from the motor is then transmitted to the beater 25 and the ram 28, with the result that the beater 25 will continuously rotate and the ram 28 reciprocates. The coal will feed by gravity from the hopper l1 through the throat I6 into the feeding casing I5 and by the ram 28 will be forced forwardly toward the discharge plate l5 of the feed casing 15. The coal thus forced toward the plate l5 will pass from the plate l8 onto the beater 25 to be directed by the beater forwardly and through the opening I4 in the plate I into the fire box of the stove.

Having thus described the invention, what is claimed as new is:

1. A stoking device comprising a supporting plate adapted to be hingedly mounted on a furnace wall, a fuel feed casing mounted on said plate for movement therewith, said casing being provided with an inlet and an outlet for granular fuel, and having at said outlet a horizontal wall extension merging into an integral inclined plate merging at its upper end internally of the casing into a substantially cylindrical trough extending transversely of said casing, a rotary beater in said trough for projecting fuel through said outlet, a pair of opposed inclined guide members arranged in said casing and terminating at their lower ends adjacent to said trough, a bottom plate for said casing slidably engaging with and supported by said guide members, said bottom plate adapted to be projected across said trough above said beater to control the delivery of fuel to the latter, means for adjusting said bottom plate and securing the latter at the desired adjustment, a fuel feeding ram supported by said bottom plate and movable along the bottom plate relative thereto, means for driving said beater, and means for reciprocating said ram.

2. The combination of a furnace formed with a fuel opening and an air inlet opening spaced downwardly from and in vertical alignment with the fuel opening, a supporting plate hingedly mounted on the furnace, a feed casing fixedly mounted on the supporting plate and having a discharge opening arranged to align with the fuel Opening in the furnace and also having at said opening an integral rearwardly projecting wall portion extending into the fuel opening of the furnace, and an integral inclined plate extending forward and upwardly from said integral wall portion, means in said casing forward of said inclined plate for forcibly feeding fuel from the casing into the furnace, a, blower suspended from and supported by the feed casing, and having an air outlet extending into the furnace through the aforementioned air inlet opening, brackets extending from said supporting plate, a motor supported by said brackets, driving connections between said motor and blower for operating the latter, and other driving connections between said motor and the fuelfeeding means for operating the latter.

CLARENCE C. LARSEN. 

